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What is B-A ?

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melguy
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What is B-A ? [#permalink] New post   21 Jun 2011, 03:49
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

25% (00:00) correct 75% (01:29) wrong based on 6 sessions
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Hello

I think angle b = 2 x angle A. So B should be sufficient?

Thanks



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Re: What is B-A ? [#permalink] New post   21 Jun 2011, 04:02
melguy wrote:
I think angle b = 2 x angle A


This is true only when triangle is inscribed inside a circle with center as R.

Also, OA is A.
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Re: What is B-A ? [#permalink] New post   21 Jun 2011, 04:05
jamifahad wrote:
melguy wrote:
I think angle b = 2 x angle A


This is true only when triangle is inscribed inside a circle with center as R.

Also, OA is A.


Thanks for clarifying.

Grockit advises that OA is E. What am I missing?

Thanks
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Re: What is B-A ? [#permalink] New post   21 Jun 2011, 04:19
Oh sucks!

It is E. Because if you do the calculation b-a will come in terms of one of the base angle i.e <X or <Y. which is unknown.
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Re: What is B-A ? [#permalink] New post   21 Jun 2011, 18:31
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This question is almost an exact copy of Q140 in the DS section of OG12. Are they charging money for these questions?

In any case, even with both statements, you can put point R very close to line XZ, in which case angle b will be very close to 180 degrees, or you can put point R very close to point Y, in which case b will be very close to 50 degrees, so the information is not sufficient, and the answer is E.
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Re: What is B-A ? [#permalink] New post   04 Jul 2011, 15:12
IMO E:
It is not mentioned which 2 sides are of same length. Hence not possible to find the value of b-a.
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Re: What is B-A ? [#permalink] New post   04 Jul 2011, 17:05
E for me... here is how I approach questions like this. Let's assume the outer triangle stays the same, and you raise point R (of the inner triangle). The value of angle "b" will change, while statements (1) and (2) remain to be true. That tells me the value of b-a cannot be determined... hope this helps.



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Re: What is B-A ? [#permalink]
04 Jul 2011, 17:05
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